Added HostListApl implementation to connect to legacy directory and GCD.

remoting/webapp/crd/js/legacy_host_list_api_unittest.js

Index: remoting/webapp/crd/js/legacy_host_list_api_unittest.js
diff --git a/remoting/webapp/crd/js/legacy_host_list_api_unittest.js b/remoting/webapp/crd/js/legacy_host_list_api_unittest.js
index ef2b598bcd8172839025b69b154a1cadaf74e2cb..045a77872819c0c46877cbda57e39fa78bda1703 100644
--- a/remoting/webapp/crd/js/legacy_host_list_api_unittest.js
+++ b/remoting/webapp/crd/js/legacy_host_list_api_unittest.js
@@ -66,7 +66,7 @@ QUnit.test('register', function(assert) {
       FAKE_HOST_NAME,
       FAKE_PUBLIC_KEY,
       FAKE_HOST_CLIENT_ID
-  ). then(function(regResult) {
+  ).then(function(regResult) {
     assert.equal(regResult.authCode, FAKE_AUTH_CODE);
     assert.equal(regResult.email, '');
   });